Need help with 2 issues but same place!

255s on 7s have a section width of ~10" But 7s are ridiculously small for a 255. I would not install them on anything less than 8s and would prefer 8.5s.
If you install those 255s on an 8, the section width will grow about 1 inch to about 11 inches. Moving the springs out of the way, and allowing .5 inch on the inboard side so you can still corner , you are up to requiring a 11.5" tub.... But don't forget that bulge in the inner tub just above the fender lip, which with a lowered ride-height, you still have to clear, Ima guessing you will not have much room left to work with in those factory tubs.
Even with airshocks and sticking the wheels out into the wind, you gotta worry about Johnny Law first, and now you pretty-much have a straightline only car. Clamping saggy springs, on the street, brings nothing to the traction event.